Full overnight closures of Highway 4 next week by Discovery Bay for bridge work

Drivers on Highway 4 just east of the Contra Costa County can expect about 40 minutes of extra travel time during the overnight hours next week.

The two-lane rural freeway will be completely closed for work on the Old River bridge from 8 p.m. to 5 a.m. Monday through Friday, ending Saturday morning, for a near three-mile stretch between the bridge and Tracy Boulevard, according to a Caltrans news release.

There will be message signs and a signed detour in place, along with an advisory radio station, to warn drivers, Caltrans said.

Westbound traffic will be detoured south on Tracy Boulevard to westbound Interstate 205 in Tracy and off at Grant Line Road to Byron Highway. Eastbound drivers will be detoured on the same roads, but in the opposite direction.